US6668464B2 - Coupling and angle encoder with such a coupling - Google Patents

Coupling and angle encoder with such a coupling Download PDF

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Publication number
US6668464B2
US6668464B2 US10/093,954 US9395402A US6668464B2 US 6668464 B2 US6668464 B2 US 6668464B2 US 9395402 A US9395402 A US 9395402A US 6668464 B2 US6668464 B2 US 6668464B2
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Prior art keywords
spring element
guide elements
coupling
stator
accordance
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Expired - Fee Related
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US10/093,954
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US20020148123A1 (en
Inventor
Johann Mitterreiter
Kurt Feichtinger
Hermann Meyer
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Dr Johannes Heidenhain GmbH
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Dr Johannes Heidenhain GmbH
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Assigned to DR. JOHANNES HEIDENHAIN GMBH reassignment DR. JOHANNES HEIDENHAIN GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FEICHTINGER, KURT, MEYER, HERMANN, MITTERREITER, JOHANN
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/347—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells using displacement encoding scales
    • G01D5/3473—Circular or rotary encoders
    • G01D5/34738—Axles; Driving or coupling means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • H02K11/21—Devices for sensing speed or position, or actuated thereby

Definitions

  • the present invention relates to a torsion-proof, but radially resilient connection of a stator of an angle encoder with a stator of an object to be measured.
  • the present invention further relates to an angle encoder having a stator and a shaft, a coupling and a spring element.
  • Angle encoders are used for determining the angular position, the angular speed or other angle-dependent values of a rotor of an object to be measured, in particular a motor, and for making them available for purposes of display, control of a machine tool, regulation or other evaluations.
  • a coupling is arranged between the stator of the angle encoder and the stationary object to be measured, which connects the stator of the angle encoder in a torsion proof, but radially and preferably also axially resilient manner, with the stationary object to be measured.
  • Such an angle encoder is known, for example, from DE 195 21 845 C2.
  • An angle encoder with a coupling between the stator and the stationary object to be measured is furthermore described in DE 200 08 590 U1.
  • the leaf spring arms of the coupling are crammed in place on the stationary object because of external pressure, or spring pressure because of a deformation of the coupling.
  • the introduction of the clamping force takes place by an axial displacement of the angle encoder with respect to the stationary object to be measured, and the clamping force is directly proportional to the relative axial position of the two elements. Assembly is made more difficult because of this.
  • An object of the present invention is based on disclosing a coupling for an angle encoder that is easy to mount.
  • a coupling for the torsion-proof, but radially resilient connection of a stator of an angle encoder with a stator of an object to be measured includes a spring element either normally in a first position but when the spring element is bent out by a bending force the spring element moves from the first position through a click point to a second position where the spring element engages a portion of the angle encoder or the spring element is normally biased in a first position but when the bias of the spring element at said first position is canceled the spring element is moved to a second position where the spring element engages a portion of the angle encoder.
  • an angle sensor that includes a first stator and a shaft for measuring an angular position between a second stator of an object to be measured and a rotor, which is rotated with respect to the second stator around an axis of rotation and a coupling for torsion-proof, but radially resilient connection of the first stator with the second stator.
  • the coupling includes a spring element that is either normally in a first position but when the spring element is bent out by a bending force the spring element moves from the first position through a click point to a second position or the spring element normally biased in a first position but when the bias of the spring element at the first position is canceled the spring element is moved to a second position.
  • the coupling can be installed in the vicinity of the bearing device of the rotor of the angle encoder, and that in spite of crowded installation conditions the coupling can be fastened to the stationary object solidly and fixed against relative rotation.
  • a stable and space-saving mounting is possible.
  • the force required for assured clamping does not act, at least not completely, on the angle encoder.
  • FIG. 1 is a cross section through an embodiment of an angle encoder with a coupling in a first mounting position in accordance with the present invention
  • FIG. 2 shows the angle encoder in FIG. 1 in the installed state
  • FIG. 3 is a perspective representation of the coupling of the angle encoder in FIGS. 1 and 2;
  • FIG. 4 is an example of a clamping area of the coupling
  • FIG. 5 is a further example of a clamping area of the coupling of FIGS. 1-3 in a sectional view;
  • FIG. 6 shows the clamping area in FIG. 5 in a view from above
  • FIG. 7 shows a second embodiment of a clamping area of the coupling of FIGS. 1-3;
  • FIG. 8 shows a third embodiment of a clamping area of the coupling of FIGS. 1-3;
  • FIG. 9 represents a second embodiment of an angle encoder with a coupling in a first mounting position in accordance with the present invention.
  • FIG. 10 shows the angle encoder in FIG. 9 in the installed state
  • FIG. 11 is a portion of the coupling in FIG. 9 in a view from above;
  • FIG. 12 represents a third embodiment of an angle encoder with a coupling in a first mounting position in accordance with the present invention.
  • FIG. 13 shows the angle encoder in FIG. 12 in the installed state.
  • FIGS. 1 to 3 A first exemplary embodiment of the invention is represented in FIGS. 1 to 3 .
  • the angle encoder 1 includes a shaft 2 , to which a graduated disk 3 with a measurement representation 4 has been attached.
  • the shaft 2 is seated, rotatable around the axis of rotation D, by a bearing device 5 in the stator 6 of the angle encoder 1 .
  • the angular position of the shaft 2 in relation to the stator 6 is measured in that the measurement representation 4 is scanned in a known manner by a scanning unit 7 affixed to the stator 6 .
  • the measurement representation 4 can be a pattern in the form of an incremental or coded graduation, which can be optically, magnetically, capacitively or inductively scanned.
  • the shaft 2 For measuring the angular position of a rotor 8 , which is rotatable around the axis of rotation D, in relation to a stationary object 9 , the shaft 2 must be connected, fixed against relative rotation, with the rotor 8 .
  • the stator 6 must also be connected in a torsion-proof manner with the stationary object 9 .
  • the rotor is the shaft 8 of an electric motor
  • the stationary object is the motor housing 9 .
  • the stator 6 is mounted on the motor housing 9 by a torsion-proof, but radially and also preferably axially elastically compensating coupling 10 .
  • one connecting area of the coupling 10 is rigidly fastened on the stator 6 of the angle encoder 1 . This can be accomplished by screws, which engage bores 13 (FIG. 3) of the coupling 10 . Fastening can also be provided by riveting, gluing or welding, but the coupling 10 can also be formed on the stator 6 .
  • the angle encoder 1 with the coupling 10 is pushed into the mounting space 11 and is axially (direction A) guided to the motor shaft 8 .
  • the spring 12 is curved so that the radial, exterior circumference of the clamping jaws 16 is less than the radius of the circumferential surface 17 .
  • an axially acting stop face 14 of the coupling 10 abuts on a stop face 15 of the motor housing 9 , which extends transversely with respect to the axis of rotation D.
  • a position is reached during the continued approach of the angle encoder 1 , in which the connecting areas 16 of the coupling 10 assigned to the motor housing 9 suddenly move radially outward and are spread against the tube-shaped circumferential surface 17 of the motor housing 9 .
  • these second connecting areas of the coupling will be called clamping jaws 16 .
  • This jump of the clamping jaws 16 from a first radial position into a second radial position of a greater radial distance (direction R) is achieved by a curved spring 19 , which jumps over from a first position into a second position by a clicker effect.
  • the clamping force required for radial clamping of the coupling 10 is introduced by the cooperation of the two stop faces 14 and 15 only until the click point of the curved spring 12 connecting the two clamping jaws 16 has been reached.
  • the bending force required for this acts counter to the curved shape of the spring 12 .
  • the bending force of the curved spring 12 needs to be supplied during the mounting process.
  • no axial force which is dependent on the radial clamping force acts anymore on the angle encoder 1 .
  • the radial clamping force is exerted by the leaf-like spring 12 , which is advantageously axially supported in the center area on the motor housing 9 after it has been bent over and therefore cannot jump over into a second position of rest, but is maintained in a position in which it exerts the maximum spreading force in the radial direction.
  • the spring 12 and the shaft 2 , or rotor 8 are of such dimensions that, in the mounted position in accordance with FIG. 2, the spring 12 does not touch the shaft 2 and the rotor 8 .
  • the spring 12 is advantageously supported in the center area on the stator 6 or on a shoulder 20 of the shaft 2 for producing the bending force in the axial direction A.
  • the jump-over of the clamping jaws 16 from a first radial position into a second radial position by the cooperation of the stop faces 14 and 15 during the insertion of the angle encoder 1 into the mounting space 11 is particularly advantageous.
  • the jump-over can also be initiated in a manner not shown by an actuating tool introduced from the outside.
  • the coupling 10 is represented in a perspective view in FIG. 3 .
  • the coupling includes a base 30 with two guide elements 31 , which are bent at right angles, extend parallel with each other and parallel with respect to the axis of rotation D, and can be screwed to the stator 6 .
  • Two further guide elements 32 are formed on the base 30 , which extend parallel with each other at least to a large extent, wherein these further guide elements 32 extend at right angles with respect to the base 30 , as well as at right angles with respect to the first guide elements 31 .
  • the clamping jaws 16 for a torsion-proof fastening on the motor housing 9 are formed at the ends of the further guide elements 32 .
  • This coupling 10 has been advantageously produced from spring steel in one piece as a punched and bent part.
  • Guide elements 31 , or 32 extending parallel with respect to the axis of rotation D, each constitute a parallel guidance in the radial direction R.
  • the base 30 and/or the tongues 31 , 32 can also be embodied in a framework-like manner in accordance with EP 0 762 081 B1.
  • the two clamping jaws 16 are connected with each other by the leaf-like spring 12 .
  • This spring 12 is curved in the shape of an arc so that it jumps over from this curved position of rest as the initial position into a second position differing from the first when a pressure force is exerted on it.
  • This pressure force also called bending force—must be of sufficient size that a click point is overcome.
  • This jump-over of the spring is also known as clicker effect since a clicking sound is generated during the jumping from the curved position of rest shown in FIG. 3 into the second position shown in FIG. 4 .
  • the clamping jaws 16 can be embodied in different ways. In accordance with FIG. 4 they are embodied in such a way that they engage a groove 21 , coming to a point, of the motor housing 9 . In accordance with FIGS. 5 and 6, the clamping jaws 16 additionally are interlockingly connected in the circumferential direction (direction of rotation of the shaft 2 ) with the motor housing 9 . At least one recess 23 is provided for this purpose in each clamping jaw 16 , which is engaged by a protrusion in the form of a pin 24 of the motor housing 9 . The clamping jaws 16 are supported in a radially clamping manner on the pins 24 and/or on the tube-shaped circumferential surface 17 .
  • the recesses 23 are conically shaped and taper radially inward, so that the edges of the recess 23 are pushed against the pins 24 free of play by the radial clamping forces.
  • the interlocking connection acts as a safety against twisting.
  • the interlocking connection can also be provided by depressions on the motor housing 9 , which are engaged by protrusions of the clamping jaws 16 .
  • the clamping jaws 16 in accordance with FIG. 7 also engage a groove 25 of the motor housing 9 in an interlocking manner.
  • Elements 26 which increase the static friction, for example in the form of a rubber coating, are arranged at the ends of the clamping jaws 16 .
  • the clamping jaws 16 in accordance with FIG. 8 are designed as V-shaped spreading elements.
  • FIGS. 9 to 11 A second example of an angle encoder 1 with a coupling 10 is represented in FIGS. 9 to 11 .
  • the two clamping jaws 16 are connected with each other by the leaf-shaped spring 12 .
  • This spring 12 is a leaf spring or a diaphragm, curved in an arc shape, so that it is displaced from this curved, biased position of rest as the initial position into a second position differing therefrom, in particular by being bent out.
  • the curved position of rest of the spring 12 is predetermined by at least one pin 27 of the shaft 2 .
  • the spring 12 is biased, bent in the axial direction, by the pin 27 .
  • the angle encoder 1 with the coupling 10 fastened thereon is inserted in this position, represented in FIG. 9, into the mounting space 11 and the shaft 2 is connected, fixed against relative rotation, with the shaft 8 . Thereafter the bias of the spring 12 is cancelled, so that it jumps over into a second position and the two clamping jaws 16 , which are located radially opposite each other, move radially outward and are clamped in a torsion-proof manner against the circumferential surface 17 .
  • the cancellation of the bias of the spring 12 takes place by rotating the shaft 2 (schematically represented in the view from above in FIG. 11) until the pin 27 fastened thereon reaches a recess 29 of the spring 12 and permits an axial movement of the spring 12 .
  • FIG. 10 The end position of the spring 12 and of the clamping jaws 16 achieved by this is represented in FIG. 10 .
  • Disassembly is performed in that the angle encoder 1 with the coupling 10 fastened thereon is pulled out of the mounting space 11 —possibly by an auxiliary tool—and in the process the spring 12 comes into contact with stops 28 arranged on the shaft 2 and in this way bends them out axially, because of which the radial distance between the clamping jaws 16 is reduced and the clamping jaws 16 come out of contact with the circumferential surface 17 .
  • FIGS. 12 and 13 A third example of an angle encoder 1 with a coupling 100 is represented in FIGS. 12 and 13.
  • the coupling 100 again includes first guide elements 310 which are fastened in a torsion-proof manner on the stator 6 of the angle encoder 1 , and of further guide elements 320 , which are clampingly fastened in a torsion-proof manner on the motor housing 9 by clamping jaws 160 .
  • the curved leaf-shaped spring 120 for achieving the clicker effect is the base 300 of the coupling 100 , on which the guide elements 310 and 320 are formed.
  • the angle encoder 1 with the coupling 100 mounted thereon is displaced in the axial direction A into the mounting space 11 until the stop faces 140 of the coupling 100 come into contact axially with the stop faces 150 of the motor housing 9 .
  • a position is reached, in which a bending force directed opposite the arc shape is exerted on the spring 120 , during which the click point for the jump-over of the spring 120 is passed.
  • the angle encoder 1 moves further in the direction of the shaft 8 until the outer cone of the shaft 8 comes into contact with the inner cone of the shaft 2 and the shafts 8 and 2 are frictionally connected with each other by this.
  • This second mounting position is represented in FIG. 13 .
  • connection of the coupling 100 with the motor housing 9 is based on the clicker effect of a spring 120 , in that prior to the jump-over of the spring 120 the clamping jaws 160 have a lesser mutual distance from each other in the radial direction R than after the jump-over of the spring 120 .
  • the clamping jaws 160 are spread in the radial direction R against the tube-shaped circumferential surface 17 of the motor housing 9 , and are therefore clampingly supported in a torsion-proof manner.
  • the mounting space 11 is closed by a cover 400 at the end of the mounting process.
  • the guide elements 31 , 32 , 310 , 320 are advantageously radially deflectable leaf springs.
  • the explained clamping of the coupling 10 , 100 can alternatively or additionally also be employed between the coupling 10 , 100 and the stator 6 of the angle encoder 1 .
  • the coupling 10 , 100 is advantageously arranged at the end of the angle encoder 1 toward the shaft in a space-saving manner. However, it can also be fastened on the other end of the angle encoder.
  • the frictional and/or interlocked torsion-proof connection of the shafts 2 and 6 can take place by known tools with screws or collet chucks.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
US10/093,954 2001-03-09 2002-03-08 Coupling and angle encoder with such a coupling Expired - Fee Related US6668464B2 (en)

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Application Number Priority Date Filing Date Title
DE10111368 2001-03-09
DE10111368 2001-03-09
DE10111368.4 2001-03-09

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060277771A1 (en) * 2005-06-11 2006-12-14 Johann Mitterreiter Coupling and angular position measuring device using the coupling
US20080028629A1 (en) * 2006-08-05 2008-02-07 Andreas Schroter Position measuring arrangement and procedure for the assembly of a position measuring arrangement
US20110078911A1 (en) * 2009-10-01 2011-04-07 Sick Stegmann Gmbh Encoder
US20110254542A1 (en) * 2010-04-19 2011-10-20 Hermann Meyer Assembly for an Angular Position Measuring Device
CN104104191A (zh) * 2014-05-14 2014-10-15 深圳市今天国际物流技术股份有限公司 一种编码器安装连接装置
US20230041061A1 (en) * 2019-12-04 2023-02-09 Sew-Eurodrive Gmbh & Co. Kg Electric motor having a fan guard and rotor shaft mounted rotatably relative to the fan guard and angle sensor

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DE10022555A1 (de) * 2000-05-10 2001-11-15 Heidenhain Gmbh Dr Johannes Winkelmeßeinrichtung
EP1528369B1 (de) * 2003-10-27 2014-03-12 SICK STEGMANN GmbH Optischer Drehwinkelsensor
DE102005060519A1 (de) * 2005-12-11 2007-06-14 Valeo Schalter Und Sensoren Gmbh Drehwinkelsensor und Drehwinkelsensorsystem
EP1960733A1 (de) 2005-12-11 2008-08-27 Valeo Schalter und Sensoren GmbH Drehwinkelsensor und drehwinkelsensorsystem
EP2631607A1 (de) * 2012-02-21 2013-08-28 Moog Unna GmbH Adapter zur Montage zweier Encoder an einer Welle
EP2693170B1 (de) * 2012-07-31 2014-09-24 SICK STEGMANN GmbH Statorkupplung
US10113446B2 (en) * 2014-02-20 2018-10-30 Mitsubishi Heavy Industries Compressor Corporation Rotary machine system
FR3059489B1 (fr) * 2016-11-25 2023-07-14 Leroy Somer Moteurs Ensemble de fixation d'un codeur sur une machine tournante
DE102016223681A1 (de) * 2016-11-29 2018-05-30 Schaeffler Technologies AG & Co. KG Klappenanordnung für ein Fahrzeug
ES2727850T3 (es) * 2017-03-29 2019-10-21 Heidenhain Gmbh Dr Johannes Sistema de medición de ángulos
CN107329414B (zh) * 2017-07-27 2023-06-20 苏州珂锐铁电气科技有限公司 一种变频触发装置
EP3493369A1 (de) * 2017-11-29 2019-06-05 Siemens Aktiengesellschaft Halterung von stator im gehäuse durch federelemente
CN108225230B (zh) * 2017-12-27 2023-10-20 广州充圆精密光电仪器有限公司 便携式三坐标测量机
CN112211986A (zh) * 2019-07-11 2021-01-12 中冶宝钢技术服务有限公司 起升测速编码器总成装置及机械设备
EP3945291A1 (de) * 2020-07-27 2022-02-02 Siemens Aktiengesellschaft Befestigungselement, insbesondere drehmomentstütze, und maschine
CN114705118B (zh) * 2022-04-25 2024-02-20 潍柴动力股份有限公司 一种斜盘的转角测量装置

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060277771A1 (en) * 2005-06-11 2006-12-14 Johann Mitterreiter Coupling and angular position measuring device using the coupling
US7469478B2 (en) 2005-06-11 2008-12-30 Dr. Johannes Heidenhain Gmbh Coupling and angular position measuring device using the coupling
US20080028629A1 (en) * 2006-08-05 2008-02-07 Andreas Schroter Position measuring arrangement and procedure for the assembly of a position measuring arrangement
US7500320B2 (en) * 2006-08-05 2009-03-10 Dr. Johannes Heidenhain Gmbh Position measuring arrangement and procedure for the assembly of a position measuring arrangement
CN101178318B (zh) * 2006-08-05 2011-09-14 约翰尼斯海登海恩博士股份有限公司 位置测量装置和用于位置测量装置装配的方法
US20110078911A1 (en) * 2009-10-01 2011-04-07 Sick Stegmann Gmbh Encoder
US8181353B2 (en) * 2009-10-01 2012-05-22 Sick Stegmann Gmbh Encoder
US20110254542A1 (en) * 2010-04-19 2011-10-20 Hermann Meyer Assembly for an Angular Position Measuring Device
US8584369B2 (en) * 2010-04-19 2013-11-19 Dr. Johannes Heisenhain GmbH Assembly for an angular position measuring device
CN104104191A (zh) * 2014-05-14 2014-10-15 深圳市今天国际物流技术股份有限公司 一种编码器安装连接装置
CN104104191B (zh) * 2014-05-14 2016-08-24 深圳市今天国际物流技术股份有限公司 一种编码器安装连接装置
US20230041061A1 (en) * 2019-12-04 2023-02-09 Sew-Eurodrive Gmbh & Co. Kg Electric motor having a fan guard and rotor shaft mounted rotatably relative to the fan guard and angle sensor

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DE10203278B4 (de) 2012-11-22
US20020148123A1 (en) 2002-10-17
DE10203278A1 (de) 2002-09-12

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